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Method for preparing modified starch adhesive for timber

A starch adhesive and modification technology, applied in the direction of starch-derived adhesives, adhesive types, etc., can solve the problems of difficult operation, complicated production process, and no real use, etc., and achieve low cost and good storage stability Effect

Active Publication Date: 2011-08-17
ZHEJIANG SHENGHUA YUNFENG GREENEO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

On the surface, it can meet the requirements of the standard from the test results, but due to the complicated production process or high cost, the use of chemical raw materials is limited, the stability of the finished product is poor, and it is difficult to operate in the actual use process. Not really used in production yet

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0012] Example: Add 30 kg of water into a 100L reaction kettle, start the agitator, add 36 kg of starch and stir for 10 minutes and heat to 55°C, adjust the pH value to 3 with hydrochloric acid, add 0.8 kg of potassium persulfate, and keep warm After reacting for 60 minutes, use NaOH solution to adjust the pH value to 10 and cool down to 40°C, add 4 kg of glacial acetic acid to react for 20 minutes, then adjust the pH to 9-10, add 4 kg of oxalic acid to react for 20 minutes, cool to below 40°C and discharge That is, a stable modified starch emulsion is obtained.

[0013] In a container with a stirrer, add 50 kg of the above-mentioned modified starch emulsion, 20 kg of PVA (polyvinyl alcohol) solution with a mass percentage of 10%, 5 kg of polyvinyl acetate emulsion, 8 kg of flour, light carbonic acid 4 kg of calcium, after stirring for 10 minutes, add 6 kg of PMDI (polydiphenylmethane diisocyanate), and stir for 15 minutes, then use it for cloth glue of wood veneer.

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PUM

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Abstract

The invention discloses a method for preparing modified starch adhesive for timber, which comprises the following steps of: performing acid hydrolysis and oxidation on corn starch to reduce the molecular weight of the starch, performing esterification and cross linking on the corn starch to obtain stable modified starch emulsion, and then adding adhesion promoter, filling agent and cross-linking agent to obtain the totally formaldehyde-free modified starch adhesive for the timber. The adhesion performance of the adhesive can meet the requirement of class II adhesive for the timber, and the adhesive uses the basically same operating method as urea resin adhesive. The modified starch adhesive prepared by the processing method has good storage stability and low cost, and can be used for producing various boards such as veneers, laminated wood boards, jointed boards and the like.

Description

technical field [0001] The invention relates to an adhesive, in particular to a preparation method of a cornstarch adhesive for wood. Background technique [0002] Formaldehyde-based adhesives are commonly used in wood adhesives, most of which use cheap urea-formaldehyde resins. The biggest disadvantage of the wood products produced therefrom is that it will release formaldehyde gas which is harmful to the human body and endanger people's health. To this end, the state has formulated mandatory standards to limit the amount of formaldehyde released from wood products. In order to meet the requirements of the standard, the manufacturer modified it by adding formaldehyde scavengers such as urea and melamine. Although the modification can reduce the amount of formaldehyde released, it affects its bonding performance and cannot completely eliminate the release of formaldehyde. Whether to develop wood adhesives that do not contain formaldehyde and have a cost similar to that of ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09J103/04
Inventor 顾水祥
Owner ZHEJIANG SHENGHUA YUNFENG GREENEO